Yep, and in this case, it's isomorphic to the question, "Why didn't Kevin De Leon(D) defeat DiFi in the 2018 election?" - question whose answers can range from, "not enough votes," to "less money," to "why did the CA coast prefer DiFi and CA's interior prefer KDL?"
The problem is last time her opponent wasn't reputable enough to be a good counterweight. I wish Katy Porter had run and replaced her. I think she was barely in politics then.